Fuel-pump for internal-combustion engines



G LARGE FUEL PUMP FOR INTERNAL COMBUSTION ENGINES- APPLICATION FILED NOV-17, 1919- Patented Oct. 11,1921.

GEDTHLBIHE I WOM/LW UNITED STATES PATENT OFFICE.

GEORGE LARGE, OF PORT WASHINGTON,

FACTURING- COMPAN Y, OF PO WISCONSIN, ASSIGNOR TO GILSON MANU- RT WASHINGTON, WISCONSIN.

FUEL-PUMP r03 INTERNAL-COMBUSTION Enem es.

To all whom it may concern Be it known that I, Gnoncn LARGE, a citizen of the United States, and resident of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented certain new and'useful Improvements in Fuel- Pumps for Internal-Combustion Engines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvement in pumps, more particularly of the type adapted for association with heavy duty internal combustion engines for pumping oil or other fuel from the main supply reservoir to the carbureter of the on 0'1116. 6 Pumps of this nature have heretofore required drive mechanism independent of the engine gear for procuring the necessary reciprocating movements of their plungers.

It is primarily the object of my invention to simplify the general structure of engines of the foregoing type by eliminating independent drive mechanism for the fuel pump, and it is more particularly my object to utilize the reciprocating movement of the tappet valve mechanism of the engine in procuring operation of the pump.

A further object resides in the provision of an exceedingly simple and effective pump mechanism adapted for operation in the aforedescribed manner.

With the above and other objects and advantages in view, which will be apparent as the description proceeds, my invention resides in the novel features of construction, combination and arrangement of the parts as hereinafter described and defined by the appended claims.

In the accompanying drawings:

Figure 1 is a plan view of my improved pump structure associated with the cylinder head end portion of an internal combustion engine, the cylinder being shown in section. Fig. 2 is a sectional view through the pump on a plane indicated by the line 2-2 of Fig. 1.

Referring now more particularly to the accompanying drawings, 5 designates the cylinder of an internal combustion engine which is closed by the end head 6 having formed therein the usual inlet and outlet ports 7 and 8 respectively. The inlet port is controlled by a spring valve 9 carried on a stem 10 extending through the cylinder Specification of Letters Patent.

17, 1919. Serial No. 338,541.

head and resiliently urged to closing position by a spring 11. The outlet port 8 is controlled by the usual tappet valve 12 carried ona stem 13 slidable in the cylinder head and resiliently urged to' closing position by a relatively strong spring 14, the valve being dental to operation of one end of the lever being engageable with the headed out end of the valve stem 13 while the other end of the lever with the usual tappet rod 17 which is reciprocated by a val y improved pump mechanism associated wlth this engine structure includes a verti cal pump chamber formed by the hollow cross portion 18 of a T-shaped casting. The shank 19 of said casting carries an attachlng arm 20 secured by bolts 21 to the pivot arm of the pump lever, the shank being thus mounted to extend toward the tappet lever 15. The end portions of the bore of the cross piece 18 are counter-sunk to receive upper and lower connecting nipples 22 and 23 adapted for connection respectively with pipes (not shown) leading to the engine carbureter and to a suitable main fuel reservoir. Annular valve seating shoulders 24 are formed at the inner ends of the countersunk portions of the cross piece and balls 25 are disposed in the counter-sunk portions, the upper ball normally resting against the corresponding valve seat 24 while the lower ball normally rests on and closes the nipple 23, the other valve seat 24 being idle and merely affording a reversible nature to the pump casting. A piston plunger is slidable in the shank 19 of the casting, a suitable packing gland 27 being disposed about the plunger at the outer end of the shank. The outer end of the plunger is disposed between a pair of pivot ears 28 on the adjacent portion of the tappet lever 15 and is connected therewith by pin 29, there being sufficient looseness of parts to compensate for the arcuate rocking movement of the lever end.

In operation the piston plunger is thus reciprocated upon each reciprocation of the tappet mechanism incidental to the opera tion of the engine whereby to draw oil or other fuel liquid from the nipple 23 and discharge the same through the nipple 22 to the carburetor, the capacity of the pump be- Patented Oct. 11, 1921.

ing so proportioned with respect to the reciprocative movement of the tappet mechanism as to supply an adequate amount of fuel liquid to the carbureter under normal running conditions of the engine.

An efficient and exceedingly simple arrangement is thus provided which eliminates the necessity of independent driving mechanism for the fuel pump of the engine and which conduces to the provision of an exceedingly compact and simple engine structure.

While I have shown and described a preferred form of my invention, it will be appreciated that various changes and modifications ofstructure and arrangement of parts may be employed to meet differing conditions of use and manufacture without departing in any manner from the spirit of my invention which resides in the utilization of the tappet valve mechanism to procure direct driving action of the fuel pump.

What is claimed is:

1. In an internal combustion engine, the combination with a cylinder head of a tappet valve including a stem projecting from the cylinder head, a pivot arm on the cylinder head, a tappet lever intermediately pivoted on said arm and having one end engageable with the valve stem, means pivoted to the opposite end of the lever for actuating the same, fuel pump including a casing, an arm supporting the casing and secured to said pivot arm, and a piston plunger extending into the pump casing and pivotally connecting it with the tappet lever between its fulcrum and the actuating means.

2. The combination with a cylinder head of an internal combustion engine, of a tappet valve including a stem projecting from said cylinder head, a tappet lever fulcrumed intermediate its ends and having an abutment carried at one end engageable with the valve stem, a fuel pump including a casing and a plunger reciprocable within the casing, said plunger having a stem pivotally connected with said tappet lever on the opposite side of its fulcrum from said abutment.

In testimony that I claim the foregoing I have hereunto set my hand at Port Washington, in the county of Ozaukee and State of Wisconsin.

GEORGE LARGE. 

